package com.encryption.md5;

import java.security.MessageDigest;

/**
 * MD5加密
 * message-digest algorithm 5 （信息-摘要算法）
 * @author Roger
 */
public class MD5Util {

	/**
	 * MD5加密 生成32位md5码
	 * 
	 * @param 待加密字符串
	 * @return 返回32位md5码
	 */
	public static String md5Encode(String inStr) {
		try {
			MessageDigest md5 = null;
			try {
				md5 = MessageDigest.getInstance("MD5");
			} catch (Exception e) {
				System.out.println(e.toString());
				e.printStackTrace();
				return "";
			}

			byte[] byteArray = inStr.getBytes("UTF-8");
			byte[] md5Bytes = md5.digest(byteArray);
			StringBuffer hexValue = new StringBuffer();
			for (int i = 0; i < md5Bytes.length; i++) {
				int val = ((int) md5Bytes[i]) & 0xff;
				if (val < 16) {
					hexValue.append("0");
				}
				hexValue.append(Integer.toHexString(val));
			}
			return hexValue.toString();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public static void main(String[] args) {
		try {
			System.out.println(MD5Util.md5Encode("123456"));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}
